112 Hubbard — High Level Terraces in Southeastern Ohio. 



been recognized at a few points, but, as a rule, no trace of them 

 can be found at tbe levels of the deltas. If there has been 

 time enough for shoreline cliffs and terraces in the Ohio valley 

 why not time for deltas, clays, etc.? In New York, there was 

 plenty of time during the higher stands of the lakes for a 

 splendid development of deltas and lake clays, but rarely any 

 beach terraces or cliffs can be found. 



It is also rather remarkable, if the terraces of the Ohio 

 valley are due to wave work, that they only occur along the 

 smaller valleys and never along the larger valleys where the 

 opportunity for strong wave work was best. If the few that 

 do occur are mainly due to differential weathering, it is not to 

 be expected that they should occur in the main valleys but 

 rather back in the smaller ones, where the opportunity for 

 long continued preservation of differential weathering is best. 



Ohio State University, 

 Cohim'bras, O. 



